Life of Don Bosco, Founder of the Salesian Society, 2nd edition, by J.M. Villefranche, translated by Lady Martin (London: Burns & Oates, Limited; New York: Catholic Publication Society). May be read online and available in pdf format at Google Books.
Patrology: The Lives and Works of the Fathers of the Church, by Professor Otto Bardenhewer, D.D., Ph.D., translated from the 2nd edition by Professor Thomas Joseph Shahan, D.D. (Freiburg im Breisgau; St. Louis, Mo.; Karlsruhe; Munich; Strassburg; Vienna: B. Herder, 1908). With Imprimatur, and with the approbation and recommendation of various archbishops and bishops. May be read online, and available in pdf, mobi, epub and other formats, at Open Library and Internet Archive, with a 2nd copy at Internet Archive, a 3rd copy at Internet Archive, and a 4th copy at Internet Archive.
The Secret of Sanctity, according to St. Francis de Sales and Father Crasset, S.J., translated by Ella McMahon (New York, Cincinnati, Chicago: Benziger Brothers, 1892). With Imprimatur. Available in pdf format on this page of FishEaters. Also available at HathiTrust Digital Library. May be read online, and available in pdf, mobi, epub and other formats at Open Library and Internet Archive.
“Owe no man any thing, but to love one another: for he that loveth his neighbour, hath fulfilled the law. For thou shalt not commit adultery: Thou shalt not kill: Thou shalt not steal: Thou shalt not bear false witness: Thou shalt not covet: and if there be any other commandment, it is comprised in this word: Thou shalt love thy neighbour as thyself. The love of our neighbour worketh no evil. Love, therefore, is the fulfilling of the law.” (Romans xiii, 8-10)
“Moral Absolutes: A Critique of the View of Joseph Fuchs, S.J.”, by Professor Germain Grisez, Ph.D., Anthropos: Rivista di Studi sulla Persona e la Famiglia, Vol. 1, No. 2 (October 1985): pp. 155-201. Available in pdf format through this page of The Way of the Lord Jesus.
St. Polycarp, Bishop of Smyrna, by Blomfield Jackson (London, Brighton: Society for Promoting Christian Knowledge; New York: E. & J. B. Young, 1898). May be read online, and is available in pdf, mobi, epub, and other formats at Internet Archive with a 2nd copy at Internet Archive. [This work does not appear to have been written by a Catholic Christian, but it provides the life and works of a great early Catholic of the one true Church.]
가톨릭 영상 교리 / Video Catechism of the Catholic Church, in Korean (한국어), English, and sign language, produced by the Catholic Pastoral Institute of Korea and the Catholic Peace Broadcasting Corporation. Approved by the Catholic Bishops Conference of Korea, 2020.
(Note: According to the English webpage, “The arrangement of this Video Catechism is different from that of the Catechism of the Catholic Church, and was produced as a support material to be used in the catechesis. Therefore, it is recommended that priests, religious, and catechists fully explain the content of the Catechism and utilize this video to support catechisis in the Catechumenate, re-education of the faithful, and Sunday school catechesis.”)
“[T]he Church has always looked on catechesis as a sacred duty and an inalienable right… [I]t is certainly a duty springing from a command given by the Lord and resting above all on those who in the New Covenant receive the call to the ministry of being pastors… [O]ne can likewise speak of a right: from the theological point of view every baptized person… has the right to receive from the Church instruction and education enabling him or her to enter on a truly Christian life; and from the viewpoint of human rights, every human being has the right to seek religious truth and adhere to it freely…
The specific character of catechesis, as distinct from the initial conversion-bringing proclamation of the Gospel, has the twofold objective of maturing the initial faith and of educating the true disciple of Christ by means of a deeper and more systematic knowledge of the person and the message of our Lord Jesus Christ… It is true that being a Christian means saying ” yes ” to Jesus Christ, but let us remember that this “yes” has two levels: it consists in surrendering to the word of God and relying on it, but it also means, at a later stage, endeavoring to know better and better the profound meaning of this word.
“Authentic catechesis is always an orderly and systematic initiation into the revelation that God has given of himself to humanity in Christ Jesus, a revelation stored in the depths of the Church’s memory and in Sacred Scripture, and constantly communicated from one generation to the next by a living active traditio…” (Saint John Paul the Great, Apostolic Exhortation “Catechesi Tradendae”)
Pastoral Letter to Young People on Chastity, by the Episcopal Commission for Doctrine, Canadian Conference of Catholic Bishops, January 2011. Updated March 2011. Available in pdf format on this page of the Diocese of London.